Sorry, but you're slightly off again, mate. 7.62 NATO is 7.62x51mm/.308 Winchester. AK-47/SKS shoot the 7.62x39mm.
I've never fired a 7.62 NATO converted SMLE, but I have fired a 1917 Enfield (American .30-06 based upon the SMLE action, more or less.)
Thanks for the correction my friend. I dont know it all after all . I should really know this shit given my line of work. Good to see another enthusiast..
I own/have-owned and shot all of the above, so I hope the aforementioned helps. :)